Tips and Tricks
G978 - New threading cycle
Compatibility :
DECO and MULTIDECO
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A new, multiple, repetitive, threading cycle to execute threads using a turning tool is now available with the TB-DECO ADV 2007.
This cycle can be used throughout the range of Tornos machines using TB-DECO and also for the DECO and MultiDECO machines. At the same time, the G933 cycle can always be programmed.
Why this new cycle ?
Tornos is committed to satisfying its customer requirements. This is why we can now offer the following three major improvements:
- Use of stronger tools for your internal thread cutting operations using the turning tool.
- Optimising the useful life of your turning tool, depending on the material undergoing machining.
- Optimising the finished quality of your thread.
Innovation
Managing the penetration of the turning tool according to a given angle in order to follow the flank of the thread thanks to a parameter (P15). This same parameter allows you to execute an alternating thread (zigzag). In such instances, the turning tool will successfully remove the material from one side of the flank and then from the other, so as to optimise its wear for hard materials.
Other strong points
- Perfect management of the number of passes in relation to the programmed parameters.
- Unique return path of the urning tool on axis X. This means that a commercially available tool can be used for the internal threads, whose diameter is practically equal to that of the drilling diameter.
- Similar to the cycles used on a CNC ISO.
- Comprises the same inlet parameters as the G978 cycle available on the Sigma machines.
 
Programming
Programming example of a thread using cycle.
Internal threading
Illustration of a standard commercially available internal threading turning tool for an M5 x 0.8 thread in the cycle interpretation phase.
| Parameters that can be programmed : |
| P1 |
Threading pitch (NEGATIVE for internal cutting die) |
[mm] [inch] |
| P2 |
Start of threading in X |
[mm] [inch] |
| P3 |
Start of threading in Z |
[mm] [inch] |
| P4 |
End of threading in Z |
[mm] [inch] |
| P5 |
End of threading in X |
[mm] [inch] |
| P6 |
Angle of the threading tool |
[°] |
| P7 |
Height of thread (depth) |
[mm] [inch] |
| P8 |
Outlet angle on completion of threading |
[°] |
| P9 |
Safety margin |
[mm] [inch] |
| P10 |
Number of rough passes |
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| P11 |
Height of first (rough) pass |
[mm] [inch] |
| P12 |
Number of finishing passes |
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| P13 |
Height of finishing passes |
[mm] [inch] |
| P14 |
Number of blank passes |
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| P15 |
Inlet angle in thread. Measured from the flank of the thread |
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| P16 |
Override for the return segment to the starting point |
[%] |
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